#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <Xm/DrawingA.h>
#include <Xm/MainW.h>
#include <Xm/TextF.h>
#include "mygraph.h"
#include "point.h"
#include "line.h"
#include "Xroutines.h"

static void parse_command(Widget where, XtPointer cd,  XtPointer cld);
void parse_text(char * ch, environment * env);

static void drawing_board_expose(Widget where, XtPointer cd,  XtPointer cld) {

      Clear_Screen((environment * )cd);
}

main (int argc, char * argv[]) {

    XtAppContext  app_context;
    Widget        toplevel,main_form,dialog_box;
    Arg           args[10];
    int           nargs=0;
    environment   env;

    env.xmax = 400;
    env.ymax = 400;


    toplevel = XtAppInitialize(&app_context,NULL,NULL,0,
                &argc,argv,NULL,args,nargs);

    nargs = 0;
    XtSetArg(args[nargs],XmNshowSeparator,True); nargs++;
    main_form = XtCreateManagedWidget("form",xmMainWindowWidgetClass,
	      toplevel,args,nargs);

    /*XtManageChild(main_form);*/

    nargs=0;
    XtSetArg(args[nargs],XmNwidth,env.xmax); nargs++;
    XtSetArg(args[nargs],XmNheight,env.ymax); nargs++;

    env.db = XtCreateManagedWidget("msgs",xmDrawingAreaWidgetClass,
               main_form, args,nargs);

    /* XtManageChild(env.db);*/

    XtAddCallback(env.db,XmNexposeCallback, drawing_board_expose,&env);

    setup_environment(&env);

    nargs = 0;
    dialog_box = XmCreateTextField(main_form,"Command",args,nargs);
    XtManageChild(dialog_box);
    XtAddCallback(dialog_box,XmNactivateCallback,parse_command ,&env);

    XmMainWindowSetAreas(main_form, NULL, dialog_box, NULL, NULL, env.db);

    XtRealizeWidget(toplevel);

    XtAppMainLoop(app_context);
}

static void parse_command(Widget where, XtPointer cd,  XtPointer cld) {

       char * p;
       char * value;

       value = NULL;

       p = XmTextFieldGetString(where);
       XmTextFieldSetString(where,value);
       parse_text(p,(environment *) cd);
}

void read_from_file(char * fn, environment * env)
{
    FILE * fd;
    char buf[400];

    fd = fopen(fn,"r");
    if (fd != NULL) {
	 while ( fgets(buf,400,fd) != NULL) {
	      parse_text(buf,env);
	 }
         fclose(fd);     
    }

}

void parse_text(char * ch, environment * env)
{
      char * tolk1;

      tolk1 = strtok(ch," ");
      if (!strcmp("quit",tolk1)) { exit(0); }
      if (!strcmp("line",tolk1)) { 
          line   ln;
	  ln.e1.x = atoi(strtok(NULL," "));
	  ln.e1.y = atoi(strtok(NULL," "));
	  ln.e2.x = atoi(strtok(NULL," "));
	  ln.e2.y = atoi(strtok(NULL," "));
	  dc_draw_line(ln,env);
	  return;
      }
      if (!strcmp("point",tolk1)) { 
          point   pt;
	  pt.x = atoi(strtok(NULL," "));
	  pt.y = atoi(strtok(NULL," "));
	  dc_draw_point(pt,env);
	  return;
      }
      if (!strcmp("read",tolk1)) { 
	  char * tolk2;

	  tolk2 = strtok(NULL," ");
	  read_from_file(tolk2,env);
      }
      if (!strcmp("circle",tolk1)) { 
	  draw_circle(env);
      }
      if (!strcmp("circle2",tolk1)) { 
	  draw_circle2(env);
      }
      if (!strcmp("circle3",tolk1)) { 
	  draw_circle3(env);
      }
      if (!strcmp("circle4",tolk1)) { 
	  draw_circle4(env);
      }
      if (!strcmp("output",tolk1)) { 
	  print_screen(env);
      }
      if (!strcmp("clear",tolk1)) { 
	  Clear_Screen(env);
      }
      if (!strcmp("paint",tolk1)) { 
	  int color;

	  color = atoi(strtok(NULL," "));
	  paint_screen(env,color);
      }
}